{
  "data": {
    "a": {
      "slug": "langfuse",
      "name": "Langfuse API + MCP",
      "vendor": "Langfuse (ClickHouse)",
      "vendorUrl": "https://langfuse.com",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "Open-source tracing, evaluation, prompt management and datasets for LLM apps and agents, built on OpenTelemetry.",
      "url": "https://www.anchorterminal.com/tools/langfuse",
      "markdownUrl": "https://www.anchorterminal.com/tools/langfuse.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/langfuse.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/langfuse.json",
      "repo": "https://github.com/langfuse/langfuse",
      "license": "MIT (core), commercial licence for the ee directories",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://cloud.langfuse.com/api/public",
      "packages": [
        {
          "registry": "pypi",
          "name": "langfuse"
        },
        {
          "registry": "npm",
          "name": "@langfuse/tracing"
        },
        {
          "registry": "npm",
          "name": "@langfuse/client"
        }
      ],
      "auth": "api-key",
      "authNotes": "Project-scoped key pair (public `pk-lf-...`, secret `sk-lf-...`) sent as HTTP Basic auth, for both the REST API and the MCP server at `/api/public/mcp`. Organisation-level keys exist for SCIM and admin APIs on Enterprise.",
      "pricing": "freemium",
      "pricingNotes": "Cloud Hobby is free with 50,000 units a month, 30 days of data and 2 users, no card. Core $29 a month with 100,000 units and 90 days, Pro $199 a month with 3 years of data, Enterprise $2,499 a month. Extra units cost $8 per 100,000 on paid plans, lower with volume. A unit is one trace, observation or score. Teams add-on $300 a month for SSO and fine-grained RBAC. Self-hosted open source is free with unlimited usage, you pay for your own Postgres, ClickHouse, Redis and blob storage. Self-hosted Enterprise is custom and sold on top of a ClickHouse plan (https://langfuse.com/pricing).",
      "priceSummary": "$29 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 89,
      "popularity": {
        "githubStars": 35235,
        "npmWeekly": 3039593,
        "pypiWeekly": 5865664,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://langfuse.com/docs",
      "llmsTxt": "https://langfuse.com/llms.txt",
      "openapi": "https://cloud.langfuse.com/generated/api/openapi.yml",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.datasets"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "python",
        "typescript",
        "webhooks"
      ],
      "lastRelease": "2026-10-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 72.7,
        "grade": "BB",
        "agentReady": true,
        "rank": 98,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 2,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 74,
          "maintenance": 88,
          "payments": 40,
          "reliability": 80,
          "schema": 93,
          "security": 65,
          "transparency": 85
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "high",
          "date": "2026-10-01"
        },
        "negative": -2,
        "negativeNotes": [
          "2025-11-09 to 2026-01-21. Three moderate advisories, cross-organisation enumeration of member and invitation lists (GHSA-94hf-6gqq-pj69), SSO account takeover through CSRF or phishing (GHSA-w9pw-c549-5m6w) and an unauthenticated Slack OAuth install that could link Slack to any project (GHSA-pvq7-vvfj-p98x). All fixed and published, eight to eleven months old, so -2 (https://github.com/langfuse/langfuse/security/advisories)"
        ],
        "verdict": "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.",
        "bestFor": "Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.",
        "strengths": [
          "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch",
          "Rate limits per bucket and plan, with 429 and `Retry-After` documented",
          "Per-unit cloud pricing at $8 per 100,000 units, and a free Hobby plan with 50,000 units and no card",
          "Bug bounty, SOC 2 Type II, ISO 27001 and four GitHub advisories handled in public over the last year",
          "Deprecated v1 read APIs have a dated sunset of 16 November 2026 and a migration guide"
        ],
        "weaknesses": [
          "About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode",
          "12 degraded incidents on the status page between 3 July and 30 September, mostly ingestion delays",
          "No uptime SLA found, only support response targets",
          "Hobby keeps 30 days of data and the General API bucket allows 30 requests a minute",
          "Self-hosting means running ClickHouse, Postgres, Redis and S3-compatible storage"
        ],
        "agentNotes": [
          "Allowlist only the tools the agent needs. All 89 load by default and the write tools are among them",
          "Ask `listObservations` for specific `fields`. Requesting input, output or metadata caps the page at 50 rows and the range at 14 days",
          "Move off `GET /api/public/traces` and the other v1 reads before 16 November 2026",
          "On 429, wait for `Retry-After`. MCP calls share the organisation's General API bucket",
          "Pick the regional host (cloud, us.cloud, jp.cloud, hipaa.cloud) that matches the project's keys"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 4,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "high",
            "grade": "BB",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 72.7
          }
        ],
        "editorialScores": {
          "ergonomics": 74,
          "maintenance": 88,
          "payments": 40,
          "reliability": 80,
          "schema": 93,
          "security": 65,
          "transparency": 91
        },
        "provenanceScore": 78
      },
      "connect": {
        "http": "curl -u \"$LANGFUSE_PUBLIC_KEY:$LANGFUSE_SECRET_KEY\" https://cloud.langfuse.com/api/public/projects",
        "claudeCode": "claude mcp add --transport http langfuse https://cloud.langfuse.com/api/public/mcp \\\n  --header \"Authorization: Basic $(printf '%s:%s' \"$LANGFUSE_PUBLIC_KEY\" \"$LANGFUSE_SECRET_KEY\" | base64)\""
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/langfuse"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Core plan",
          "unit": "month",
          "usd": 29,
          "note": "100,000 units included, 90 days of data"
        },
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 199,
          "note": "100,000 units included, 3 years of data"
        },
        {
          "item": "Enterprise plan",
          "unit": "month",
          "usd": 2499,
          "note": "100,000 units included, audit logs, SCIM, SLAs"
        },
        {
          "item": "Teams add-on",
          "unit": "month",
          "usd": 300,
          "note": "SSO, SSO enforcement and fine-grained RBAC on Pro"
        }
      ],
      "provenance": {
        "legalEntity": "Langfuse GmbH (a ClickHouse, Inc. company)",
        "domain": "langfuse.com",
        "domainRegistered": "2023-04-20",
        "endpointOnVendorDomain": true,
        "terms": "https://clickhouse.com/legal/clickhouse-general-terms-and-conditions",
        "privacy": "https://langfuse.com/privacy",
        "statusPage": "https://status.langfuse.com",
        "changelog": "https://langfuse.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The imprint names Langfuse GmbH in Berlin. The privacy notice is issued by ClickHouse, Inc. and langfuse.com/terms redirects to the ClickHouse general terms"
        ],
        "score": 78
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/langfuse.json",
      "live": {
        "slug": "langfuse",
        "probe": {
          "target": "https://cloud.langfuse.com/api/public",
          "method": "get",
          "lastAt": "2026-10-09T10:42:47.04669794Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 59,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 53,
          "p95ms24h": 88,
          "samples24h": 260,
          "samples30d": 2300,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 276
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 268,
              "ok": 268
            },
            {
              "date": "2026-10-09",
              "probes": 114,
              "ok": 114
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.langfuse.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-09T10:41:47.397389667Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "langfuse/langfuse",
            "version": "v4.55.0",
            "released": "2026-10-08",
            "seenAt": "2026-10-08T16:18:24.588520565Z"
          },
          {
            "registry": "npm",
            "name": "@langfuse/client",
            "version": "5.13.1",
            "seenAt": "2026-10-08T16:18:22.622711734Z"
          },
          {
            "registry": "npm",
            "name": "@langfuse/tracing",
            "version": "5.13.1",
            "seenAt": "2026-10-08T16:18:21.541544154Z"
          },
          {
            "registry": "pypi",
            "name": "langfuse",
            "version": "4.17.0",
            "released": "2026-10-05",
            "seenAt": "2026-10-08T16:18:21.419024323Z"
          }
        ],
        "githubStars": 35528,
        "npmWeekly": 3268181,
        "pypiWeekly": 6331716,
        "securityTxt": {
          "url": "https://langfuse.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:38:35.306691262Z"
        },
        "llmsTxt": {
          "url": "https://langfuse.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:33.869864319Z"
        },
        "domain": {
          "domain": "langfuse.com",
          "registered": "2023-04-20",
          "source": "https://rdap.verisign.com/com/v1/domain/langfuse.com",
          "checkedAt": "2026-10-04T13:09:17.712369699Z"
        },
        "pages": [
          {
            "url": "https://langfuse.com/changelog",
            "kind": "changelog",
            "status": 404,
            "checkedAt": "2026-10-08T18:21:16.807292557Z",
            "changedAt": "0001-01-01T00:00:00Z"
          },
          {
            "url": "https://langfuse.com/blog/joining-clickhouse",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:14.604548394Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "4e8ff98bb557"
          },
          {
            "url": "https://langfuse.com/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:18.752448188Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fa6797a4f9e7"
          },
          {
            "url": "https://langfuse.com/privacy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:20.652067587Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "9e1e582ef9a9"
          },
          {
            "url": "https://clickhouse.com/legal/clickhouse-general-terms-and-conditions",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:16:08.788877158Z",
            "changedAt": "2026-10-06T16:06:19.636505735Z",
            "fingerprint": "1be14feaa85c"
          }
        ],
        "updatedAt": "2026-10-09T10:42:47.04669794Z"
      }
    },
    "answer": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category.",
    "b": {
      "slug": "wandb-weave",
      "name": "W\u0026B Weave",
      "vendor": "Weights \u0026 Biases (CoreWeave)",
      "vendorUrl": "https://wandb.ai",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "W\u0026B Weave is CoreWeave Forge's tracing and evaluation service for LLM applications and agents. It takes traces from Python and TypeScript SDKs or an OTLP endpoint and exposes them through a REST Service API.",
      "url": "https://www.anchorterminal.com/tools/wandb-weave",
      "markdownUrl": "https://www.anchorterminal.com/tools/wandb-weave.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/wandb-weave.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/wandb-weave.json",
      "repo": "https://github.com/wandb/weave",
      "license": "Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://trace.wandb.ai",
      "packages": [
        {
          "registry": "pypi",
          "name": "weave"
        },
        {
          "registry": "npm",
          "name": "weave"
        }
      ],
      "auth": "api-key",
      "authNotes": "A Forge API key, created by a signed-in user at forge.coreweave.com/settings after signing up at id.coreweave.com/signup. The Service API takes it as `Authorization: Bearer`, the OTLP endpoints as a `wandb-api-key` header or HTTP Basic with user `api`. Personal keys reach every organisation the user belongs to. Service account keys are limited to one team or one organisation. Keys carry no per-permission scopes, the secret is shown once, and deleting a key revokes it at once.",
      "pricing": "freemium",
      "pricingNotes": "Free is $0 a month with 1 GB of Weave data ingestion. Pro starts at $60 a month with 1.5 GB, a 30 day trial and further ingestion at $0.10 per MB, billed in arrears. Enterprise is quoted, with further ingestion listed at $0.20 per MB and volume discounts on annual commitments. Ingested bytes are counted once when stored. The pricing page doesn't say whether Free needs a card (checked 2026-10-08).",
      "priceSummary": "$60 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the Weave docs, the OpenAPI document or the pricing page (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 623550,
        "pypiWeekly": 219442,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://docs.coreweave.com/products/wandb/weave",
      "llmsTxt": "https://docs.coreweave.com/llms.txt",
      "openapi": "https://trace.wandb.ai/openapi.json",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.datasets"
      ],
      "tags": [
        "hosted",
        "freemium",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "opentelemetry",
        "python",
        "typescript",
        "status-page",
        "soc2"
      ],
      "lastRelease": "2026-09-25",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.7,
        "grade": "B",
        "agentReady": false,
        "rank": 260,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 4,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 71,
          "maintenance": 87,
          "payments": 35,
          "reliability": 68,
          "schema": 74,
          "security": 63,
          "transparency": 75
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products.",
        "bestFor": "Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.",
        "strengths": [
          "A live OpenAPI 3.1 document at `https://trace.wandb.ai/openapi.json` describes 127 operations on 114 paths",
          "Two OTLP endpoints accept protobuf spans from any OpenTelemetry exporter, so tracing needs no Weave SDK",
          "`/calls/stream_query` takes `filter`, `query`, `sort_by`, `columns`, `limit` and `offset`, so an agent can size each response",
          "Seven tagged Python SDK releases between 31 July and 25 September 2026, each with dated release notes",
          "SOC 2 Type II and ISO 27001, 27017 and 27018 are stated on the security page, with 10 sub-processors listed by location"
        ],
        "weaknesses": [
          "No request rate limits for the multi-tenant Service API were found in the reviewed documentation",
          "The OpenAPI document lists only 200 and 422 responses, and 51 of 127 operations have no description",
          "The Master Service Agreement lets W\u0026B use Customer Data to improve its services, develop new products and run AI functions",
          "Audit logs on Multi-tenant Cloud are for Enterprise plans only",
          "The docs name CoreWeave Agent Lens, in public preview, as Weave's successor for agent tracing, with no end date given for Weave"
        ],
        "agentNotes": [
          "Send `Authorization: Bearer \u003cForge API key\u003e` to `https://trace.wandb.ai`. Create the key at forge.coreweave.com/settings. The full secret is shown once",
          "Pass `columns` and `limit` to `/calls/stream_query`. Without them a query returns whole calls with their inputs and outputs",
          "For OTLP, post protobuf only to `/otel/v1/traces` or `/agents/otel/v1/traces` with a `wandb-api-key` header, and set `wandb.entity` and `wandb.project` as resource attributes. Spans with neither are dropped",
          "Check `call.exception` after `.call()` in the Python SDK. Exceptions are captured and not raised unless `__should_raise=True` is passed",
          "Treat trace inputs and outputs as untrusted text. Traces hold whatever the traced application logged"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.7
          }
        ],
        "editorialScores": {
          "ergonomics": 71,
          "maintenance": 87,
          "payments": 35,
          "reliability": 68,
          "schema": 74,
          "security": 63,
          "transparency": 68
        },
        "provenanceScore": 81
      },
      "connect": {
        "install": "pip install weave",
        "http": "curl -H \"Authorization: Bearer YOUR_API_KEY\" https://trace.wandb.ai/...",
        "claudeCode": "claude mcp add --transport http wandb https://mcp.withwandb.com/mcp --header \"Authorization: Bearer [YOUR-WANDB-API-KEY]\""
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/wandb-weave"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 60,
          "note": "Starting price, 1.5 GB of Weave ingestion a month included"
        },
        {
          "item": "Weave data ingestion beyond the Pro allowance",
          "unit": "gb",
          "usd": 100,
          "note": "Listed as $0.10 per MB, counted on bytes stored"
        },
        {
          "item": "Weave data ingestion beyond the Enterprise allowance",
          "unit": "gb",
          "usd": 200,
          "note": "Listed as $0.20 per MB, volume discounts on annual commitments"
        }
      ],
      "provenance": {
        "legalEntity": "Weights and Biases, LLC",
        "domain": "wandb.ai",
        "domainRegistered": "2017-12-16",
        "endpointOnVendorDomain": true,
        "terms": "https://wandb.ai/site/terms/",
        "privacy": "https://docs.coreweave.com/policies/terms-of-service/privacy-policy",
        "statusPage": "https://status.forge.coreweave.com",
        "changelog": "https://docs.coreweave.com/release-notes/weave-sdk-releases",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "The W\u0026B Master Service Agreement, last updated 30 September 2026, names Weights and Biases, LLC, a Delaware company at 400 Alabama Street, San Francisco. The products are sold as CoreWeave Forge.",
          "wandb.ai/site/privacy redirects to CoreWeave's privacy policy, last updated 24 February 2026, which covers CoreWeave, Inc. and its affiliates as controller and says it doesn't apply to data processed for customers. The DPA of 22 April 2026 at wandb.ai/site/dpa covers that data.",
          "The Service API and OTLP endpoints run on trace.wandb.ai. The hosted MCP server runs on mcp.withwandb.com and the console on forge.coreweave.com.",
          "wandb.ai/.well-known/security.txt redirects to a Forge page that answers \"Invalid .well-known request\", and coreweave.com/.well-known/security.txt returns 404. The security page takes reports at security@coreweave.com.",
          "status.wandb.com, which the SLA cites, redirects to status.forge.coreweave.com.",
          "RDAP for wandb.ai gives a registration date of 2017-12-16."
        ],
        "score": 81
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/wandb-weave.json",
      "live": {
        "slug": "wandb-weave",
        "probe": {
          "target": "https://trace.wandb.ai",
          "method": "get",
          "lastAt": "2026-10-09T10:43:01.716917218Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 144,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 144,
          "p95ms24h": 239,
          "samples24h": 33,
          "samples30d": 33,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 33,
              "ok": 33
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.forge.coreweave.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-09T10:42:09.469868562Z"
        },
        "updatedAt": "2026-10-09T10:43:01.716917218Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Langfuse (ClickHouse)",
        "b": "Weights \u0026 Biases (CoreWeave)",
        "name": "Vendor"
      },
      {
        "a": "https://cloud.langfuse.com/api/public",
        "b": "https://trace.wandb.ai",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP, Streamable HTTP",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "MIT (core), commercial licence for the ee directories",
        "b": "Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT",
        "name": "Licence"
      },
      {
        "a": "89",
        "b": "none",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-10-01",
        "b": "2026-09-25",
        "name": "Last release"
      },
      {
        "a": "2026-06-24",
        "b": "2026-09-30",
        "name": "Terms last updated"
      },
      {
        "a": "2026-08-21",
        "b": "2026-02-24",
        "name": "Privacy policy last updated"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "35k stars, 3M npm/wk, 5.9M PyPI/wk",
        "b": "624k npm/wk, 219k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "4/5 (2)",
        "b": "none",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category.",
        "question": "Which is better for AI agents, Langfuse API + MCP or W\u0026B Weave?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do Langfuse API + MCP and W\u0026B Weave need an API key?"
      },
      {
        "answer": "Yes. Langfuse API + MCP has a hosted endpoint at https://cloud.langfuse.com/api/public and W\u0026B Weave at https://trace.wandb.ai.",
        "question": "Can an agent call Langfuse API + MCP and W\u0026B Weave without installing anything?"
      },
      {
        "answer": "Yes. Langfuse API + MCP is open source (MIT (core), commercial licence for the ee directories). W\u0026B Weave is open source (Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT).",
        "question": "Are Langfuse API + MCP and W\u0026B Weave open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 80 against 68",
          "Schema \u0026 documentation, 93 against 74",
          "Payments \u0026 pricing, 40 against 35",
          "Transparency \u0026 trust, 85 against 75"
        ],
        "also": [
          "Agent-ready, a grade of BB or better",
          "Free to start without a card"
        ],
        "goodFor": "Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.",
        "slug": "langfuse",
        "watchFor": "About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode"
      },
      {
        "aheadOn": null,
        "also": null,
        "goodFor": "Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.",
        "slug": "wandb-weave",
        "watchFor": "No request rate limits for the multi-tenant Service API were found in the reviewed documentation"
      }
    ],
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        "title": "Arize Phoenix vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave.json",
        "title": "Arize Phoenix vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/baserun-vs-langfuse.json",
        "title": "Baserun vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/baserun-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.json",
        "title": "Baserun vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/baserun-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse.json",
        "title": "Braintrust API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave.json",
        "title": "Braintrust API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/galileo-vs-langfuse.json",
        "title": "Galileo API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/galileo-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/galileo-vs-wandb-weave.json",
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        "url": "https://www.anchorterminal.com/compare/galileo-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langfuse.json",
        "title": "Helicone AI Gateway + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.json",
        "title": "Helicone AI Gateway + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/honeyhive-vs-langfuse.json",
        "title": "HoneyHive vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave.json",
        "title": "HoneyHive vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/laminar-vs-langfuse.json",
        "title": "Laminar API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/laminar-vs-langfuse"
      },
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        "json": "https://www.anchorterminal.com/compare/laminar-vs-wandb-weave.json",
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        "url": "https://www.anchorterminal.com/compare/laminar-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith.json",
        "title": "Langfuse API + MCP vs LangSmith API + MCP",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch.json",
        "title": "Langfuse API + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-prefactor.json",
        "title": "Langfuse API + MCP vs Prefactor",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-prefactor"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-respan.json",
        "title": "Langfuse API + MCP vs Respan API + MCP",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-respan"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.json",
        "title": "LangSmith API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.json",
        "title": "LangWatch vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave.json",
        "title": "Prefactor vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/respan-vs-wandb-weave.json",
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        "url": "https://www.anchorterminal.com/compare/respan-vs-wandb-weave"
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    "scores": [
      {
        "by": 12,
        "edge": "langfuse",
        "key": "reliability",
        "langfuse": 80,
        "name": "Reliability",
        "wandb-weave": 68,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 19,
        "edge": "langfuse",
        "key": "schema",
        "langfuse": 93,
        "name": "Schema \u0026 documentation",
        "wandb-weave": 74,
        "weight": 13
      },
      {
        "by": 3,
        "edge": "langfuse",
        "key": "ergonomics",
        "langfuse": 74,
        "name": "Agent ergonomics",
        "wandb-weave": 71,
        "weight": 13
      },
      {
        "by": 2,
        "edge": "langfuse",
        "key": "security",
        "langfuse": 65,
        "name": "Security \u0026 auth",
        "wandb-weave": 63,
        "weight": 14
      },
      {
        "by": 5,
        "edge": "langfuse",
        "key": "payments",
        "langfuse": 40,
        "name": "Payments \u0026 pricing",
        "wandb-weave": 35,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 1,
        "edge": "langfuse",
        "key": "maintenance",
        "langfuse": 88,
        "name": "Maintenance \u0026 community",
        "wandb-weave": 87,
        "weight": 7
      },
      {
        "by": 10,
        "edge": "langfuse",
        "key": "transparency",
        "langfuse": 85,
        "name": "Transparency \u0026 trust",
        "wandb-weave": 75,
        "weight": 7
      }
    ],
    "summary": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category. Both do obs traces.",
    "verdicts": {
      "langfuse": "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.",
      "wandb-weave": "The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products."
    }
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  "links": {
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    "json": "https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.json",
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  "markdown": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category. Both do obs traces.\n\n- Langfuse API + MCP: grade BB, 72.7/100, rank #98 of 842. Markdown https://www.anchorterminal.com/tools/langfuse.md · JSON https://www.anchorterminal.com/api/v1/tools/langfuse.json\n- W\u0026B Weave: grade B, 66.7/100, rank #260 of 842. Markdown https://www.anchorterminal.com/tools/wandb-weave.md · JSON https://www.anchorterminal.com/api/v1/tools/wandb-weave.json\n\n## Which one, for what\n\n### Langfuse API + MCP (BB)\n\nGood for: Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.\n\nAhead on:\n- Reliability, 80 against 68\n- Schema \u0026 documentation, 93 against 74\n- Payments \u0026 pricing, 40 against 35\n- Transparency \u0026 trust, 85 against 75\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- Free to start without a card\n\nWatch for: About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode\n\n### W\u0026B Weave (B)\n\nGood for: Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.\n\nWatch for: No request rate limits for the multi-tenant Service API were found in the reviewed documentation\n\n\n## Score by category\n\n| Category | Weight | Langfuse API + MCP | W\u0026B Weave | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 68 | Langfuse API + MCP +12 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 93 | 74 | Langfuse API + MCP +19 |\n| Agent ergonomics | 13% (16.2 this run) | 74 | 71 | Langfuse API + MCP +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 65 | 63 | Langfuse API + MCP +2 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 35 | Langfuse API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 88 | 87 | Langfuse API + MCP +1 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 75 | Langfuse API + MCP +10 |\n| Negative events | ≤15 | -2 | 0 | |\n| **Total** | | **72.7 · BB** | **66.7 · B** | |\n\n## Facts side by side\n\n| Fact | Langfuse API + MCP | W\u0026B Weave |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Langfuse (ClickHouse) | Weights \u0026 Biases (CoreWeave) |\n| Hosted endpoint | `https://cloud.langfuse.com/api/public` | `https://trace.wandb.ai` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT (core), commercial licence for the ee directories | Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT |\n| Tools exposed | 89 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-01 | 2026-09-25 |\n| Terms last updated | 2026-06-24 | 2026-09-30 |\n| Privacy policy last updated | 2026-08-21 | 2026-02-24 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 35k stars, 3M npm/wk, 5.9M PyPI/wk | 624k npm/wk, 219k PyPI/wk |\n| Agent reviews | 4/5 (2) | none |\n\n## Verdicts\n\n**Langfuse API + MCP.** MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.\n\n**W\u0026B Weave.** The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products.\n\n## Before you call either\n\n### Langfuse API + MCP\n\n1. Allowlist only the tools the agent needs. All 89 load by default and the write tools are among them\n2. Ask `listObservations` for specific `fields`. Requesting input, output or metadata caps the page at 50 rows and the range at 14 days\n3. Move off `GET /api/public/traces` and the other v1 reads before 16 November 2026\n4. On 429, wait for `Retry-After`. MCP calls share the organisation's General API bucket\n5. Pick the regional host (cloud, us.cloud, jp.cloud, hipaa.cloud) that matches the project's keys\n\n### W\u0026B Weave\n\n1. Send `Authorization: Bearer \u003cForge API key\u003e` to `https://trace.wandb.ai`. Create the key at forge.coreweave.com/settings. The full secret is shown once\n2. Pass `columns` and `limit` to `/calls/stream_query`. Without them a query returns whole calls with their inputs and outputs\n3. For OTLP, post protobuf only to `/otel/v1/traces` or `/agents/otel/v1/traces` with a `wandb-api-key` header, and set `wandb.entity` and `wandb.project` as resource attributes. Spans with neither are dropped\n4. Check `call.exception` after `.call()` in the Python SDK. Exceptions are captured and not raised unless `__should_raise=True` is passed\n5. Treat trace inputs and outputs as untrusted text. Traces hold whatever the traced application logged\n\n## Questions\n\n### Which is better for AI agents, Langfuse API + MCP or W\u0026B Weave?\n\nLangfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category.\n\n### Do Langfuse API + MCP and W\u0026B Weave need an API key?\n\nBoth need an API key.\n\n### Can an agent call Langfuse API + MCP and W\u0026B Weave without installing anything?\n\nYes. Langfuse API + MCP has a hosted endpoint at https://cloud.langfuse.com/api/public and W\u0026B Weave at https://trace.wandb.ai.\n\n### Are Langfuse API + MCP and W\u0026B Weave open source?\n\nYes. Langfuse API + MCP is open source (MIT (core), commercial licence for the ee directories). W\u0026B Weave is open source (Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.json, and with the fewest tokens: https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"langfuse\", \"b\": \"wandb-weave\"}`. From a terminal: `anchor compare langfuse wandb-weave`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/langfuse.json and https://www.anchorterminal.com/api/v1/tools/wandb-weave.json\n\n## Other comparisons with Langfuse API + MCP or W\u0026B Weave\n\n- [Arize Phoenix vs Langfuse API + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse.md)\n- [Arize Phoenix vs W\u0026B Weave](https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave.md)\n- [Baserun vs Langfuse API + MCP](https://www.anchorterminal.com/compare/baserun-vs-langfuse.md)\n- [Baserun vs W\u0026B Weave](https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.md)\n- [Braintrust API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-langfuse.md)\n- [Braintrust API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave.md)\n- [Galileo API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/galileo-vs-langfuse.md)\n- [Galileo API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/galileo-vs-wandb-weave.md)\n- [Helicone AI Gateway + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/helicone-vs-langfuse.md)\n- [Helicone AI Gateway + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.md)\n- [HoneyHive vs Langfuse API + MCP](https://www.anchorterminal.com/compare/honeyhive-vs-langfuse.md)\n- [HoneyHive vs W\u0026B Weave](https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave.md)\n- [Laminar API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/laminar-vs-langfuse.md)\n- [Laminar API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/laminar-vs-wandb-weave.md)\n- [Langfuse API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/langfuse-vs-langsmith.md)\n- [Langfuse API + MCP vs LangWatch](https://www.anchorterminal.com/compare/langfuse-vs-langwatch.md)\n- [Langfuse API + MCP vs Prefactor](https://www.anchorterminal.com/compare/langfuse-vs-prefactor.md)\n- [Langfuse API + MCP vs Respan API + MCP](https://www.anchorterminal.com/compare/langfuse-vs-respan.md)\n- [LangSmith API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.md)\n- [LangWatch vs W\u0026B Weave](https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.md)\n- [Prefactor vs W\u0026B Weave](https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave.md)\n- [Respan API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/respan-vs-wandb-weave.md)\n",
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        "name": "Langfuse API + MCP vs W\u0026B Weave",
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    "description": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against W\u0026B Weave's 66.7 (B), and leads in every scored category. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Langfuse API + MCP vs W\u0026B Weave for AI agents, BB 72.7 vs B 66.7",
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